Several Michigan State University students received an eyeful and then some while walking down the hallway in the Engineering building — a calculus professor was sitting naked, leaning against the wall while police questioned him.

Campus police report that at 1:07 p.m. Monday afternoon, the professor, after appearing to have a nervous breakdown, removed all of his clothes except for his socks and started screaming obscenities at students. Students identified the professor as John McCarthy and said he was crying, screaming, “How can no one do anything right,” and “There’s no (expletive) God.”

MSU police took the man into protective custody and transported him to a local hospital. He is not being charged with a crime, according to a statement posted on MSU’s website.

The most disconcerting thing about the incident, reports a witness who wished to remain anonymous, is that it took 15 minutes for police to arrive. There also were reports McCarthy had acted oddly earlier in the semester but had not sought psychological counseling.

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The news of Monday’s incident quickly spread throughout the campus community.

Shortly after the incident, MSU junior Marc Alan Colcer, a graduate of Milford High School, said he received several text messages from fellow students — asking him if the rumors were true.

“At first I didn’t believe it could be true because it just seemed so crazy and not believable,” said Colcer. “But then the picture circulated of him in the hallway. I posted the picture on my Twitter account when I got it, and it started going viral.”

Although Colcer was not in the Engineering building at the time of the incident, the picture Colcer posted of McCarthy on his Twitter account was retweeted 141 times and was referenced in the New York Daily News.

The photograph was first posted on Reddit by a student who witnessed the incident firsthand. The student wrote, “I was in Calc 1 at Michigan State University, and my teacher was always pretty eccentric, but today he went overboard. Half way through class he started screaming at us, swearing left and right. He then started slamming his hands on the window and pressing his face against it, still screaming. Eventually he walked out and down the hallway to the end, all while screaming. He then came back into the classroom and took off his clothes, except for his socks.”

Colcer said several students think the incident is funny. But, for him, he just hopes McCarthy receives the help he needs.

“What caused a professor who had taught for so long to snap? If he did have mental issues, shouldn’t MSU have known about this? What can be done to make sure this never happens again?” said Colcer.

McCarthy, who received his doctoral degree in mathematics from Columbia University in 1983, has taught at MSU for 28 years.

On the teacher rating website ratemyprofessor.com, McCarthy was given a “poor quality” rating.

One commenter called him the worst teacher in the education profession and said, “I would have rather had an ape take my money.”